Update deps

vendor/github.com/adrg/xdg/internal/pathutil/pathutil.go

@@ -8,18 +8,17 @@ import (
 )
 
 // Unique eliminates the duplicate paths from the provided slice and returns
-// the result. The items in the output slice are in the order in which they
-// occur in the input slice. If a `home` location is provided, the paths are
-// expanded using the `ExpandHome` function.
-func Unique(paths []string, home string) []string {
+// the result. The paths are expanded using the `ExpandHome` function and only
+// absolute paths are kept. The items in the output slice are in the order in
+// which they occur in the input slice.
+func Unique(paths []string) []string {
 	var (
 		uniq     []string
 		registry = map[string]struct{}{}
 	)
 
 	for _, p := range paths {
-		p = ExpandHome(p, home)
-		if p != "" && filepath.IsAbs(p) {
+		if p = ExpandHome(p); p != "" && filepath.IsAbs(p) {
 			if _, ok := registry[p]; ok {
 				continue
 			}
@@ -32,6 +31,18 @@ func Unique(paths []string, home string) []string {
 	return uniq
 }
 
+// First returns the first absolute path from the provided slice.
+// The paths in the input slice are expanded using the `ExpandHome` function.
+func First(paths []string) string {
+	for _, p := range paths {
+		if p = ExpandHome(p); p != "" && filepath.IsAbs(p) {
+			return p
+		}
+	}
+
+	return ""
+}
+
 // Create returns a suitable location relative to which the file with the
 // specified `name` can be written. The first path from the provided `paths`
 // slice which is successfully created (or already exists) is used as a base
@@ -40,7 +51,8 @@ func Unique(paths []string, home string) []string {
 // it can also contain a set of parent directories, which will be created
 // relative to the selected parent path.
 func Create(name string, paths []string) (string, error) {
-	var searchedPaths []string
+	searchedPaths := make([]string, 0, len(paths))
+
 	for _, p := range paths {
 		p = filepath.Join(p, name)
 
@@ -48,7 +60,7 @@ func Create(name string, paths []string) (string, error) {
 		if Exists(dir) {
 			return p, nil
 		}
-		if err := os.MkdirAll(dir, os.ModeDir|0700); err == nil {
+		if err := os.MkdirAll(dir, os.ModeDir|0o700); err == nil {
 			return p, nil
 		}
 
@@ -63,7 +75,8 @@ func Create(name string, paths []string) (string, error) {
 // slice of `paths`. The `name` parameter must contain the name of the file,
 // but it can also contain a set of parent directories.
 func Search(name string, paths []string) (string, error) {
-	var searchedPaths []string
+	searchedPaths := make([]string, 0, len(paths))
+
 	for _, p := range paths {
 		p = filepath.Join(p, name)
 		if Exists(p) {
@@ -76,3 +89,29 @@ func Search(name string, paths []string) (string, error) {
 	return "", fmt.Errorf("could not locate `%s` in any of the following paths: %s",
 		filepath.Base(name), strings.Join(searchedPaths, ", "))
 }
+
+// EnvPath returns the value of the environment variable with the specified
+// `name` if it is an absolute path, or the first absolute fallback path.
+// All paths are expanded using the `ExpandHome` function.
+func EnvPath(name string, fallbackPaths ...string) string {
+	dir := ExpandHome(os.Getenv(name))
+	if dir != "" && filepath.IsAbs(dir) {
+		return dir
+	}
+
+	return First(fallbackPaths)
+}
+
+// EnvPathList reads the value of the environment variable with the specified
+// `name` and attempts to extract a list of absolute paths from it. If there
+// are none, a list of absolute fallback paths is returned instead. Duplicate
+// paths are removed from the returned slice. All paths are expanded using the
+// `ExpandHome` function.
+func EnvPathList(name string, fallbackPaths ...string) []string {
+	dirs := Unique(filepath.SplitList(os.Getenv(name)))
+	if len(dirs) != 0 {
+		return dirs
+	}
+
+	return Unique(fallbackPaths)
+}